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@techreport{EGHNPPSSTW01tr, author = {Thomas Erlebach and Martin Gantenbein and Daniel Hürlimann and Gabriele Neyer and Aris Pagourtzis and Paolo Penna and Konrad Schlude and Kathleen Steinhöfel and David Scot Taylor and Peter Widmayer}, title = {On the complexity of train assignment problems}, institution = {Department of Computer Science, ETH Zurich}, month = {Aug}, year = {2001} }